Dissociative Identity DisorderThis post-traumatic dissociative disorder was previously known as multiple personality disorder in the Diagnostic and Statistical Manual of Disorders Mental Health, Fourth Edition, Test Revision (DSM-IV-TR). The DSM-V renamed it Dissociative Identity Disorder, abbreviated DID. “The Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text Revision, describes dissociative identity disorder (DID) using two dissociative phenomena: a) amnesia (criterion C) and b) the presence of altered personalities (criteria A and B). )” (Dell, 2002, p.10). Personality dissociation is the defining characteristic of the disorder. Dissociative identity disorder is characterized by “the adoption of multiple new identities (up to 100; average is 15)” (Terwilliger, 2014). Each identity displays its own voices, postures and behaviors. Three important terms are used to talk about identities. These are changes, host and switch. “Modifies – different identities or personalities. Host – the identity that holds other identities together. Switch – rapid transformation from one personality to another” (Terwilliger, 2014). These identities were created as a natural defense mechanism that the body used to protect itself from a traumatic experience by repressing memories of it. History of Dissociative Identity Disorder Dissociative identity disorder was first diagnosed as demonic possession. This diagnosis dates back to biblical times. “This article proposes a phenomenological model of therapeutic exorcism of demons for dissociative identity disorder by using the patient's perspective on perceived demons and empowering the patient to use their own spirituality to expel them” ( Bull, 2001,...... middle of article...emergency visits with DID patients include flashbacks, self-harm, suicide attempts, and non-epileptic seizures Some patients suffer from anxiety disorders. or panics and other dissociative disorders.ConclusionDissociative identity disorder is one of the many dissociative disorders recognized by the DSM. It is differentiated by amnesia and the presence of personality alterations. had many different diagnoses for this disorder over the years The first case dates back to biblical times Over the years the name of the disorder has changed as well as different beliefs about the causes and treatments. best known is that of Sybil or Shirley Ardell Mason. This article explored his case along with others to explain the disorder, history, causes, symptoms, prognosis, diagnosis, and misdiagnosis. , treatment and comorbidity of dissociative identity disorder.